Cover of bird-cage



FIG. 1 is a perspective view from the front-left-top side of a cover of bird-cage showing my design;

FIG. 2 is a front elevational view thereof, the rear side being a mirror image;

FIG. 3 is a left side elevational view thereof, the right side being a mirror image;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a cover of bird-cage, as shown and described. 